#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main() {
    int n = 0, m = 0, arr1[100][100] = { 0 }, arr2[100][100] = { 0 }, count = 0;
    scanf("%d %d", &n, &m);
    int i = 0, j = 0;
    for (i = 0; i < m; i++)
    {
        for (j = 0; j < n; j++)
        {
            scanf("%d", &arr1[i][j]);
        }
    }
    for (i = 0; i < m; i++)
    {
        for (j = 0; j < n; j++)
        {
            scanf("%d", &arr2[i][j]);
        }
    }
    for (i = 0; i < m; i++)
    {
        for (j = 0; j < n; j++)
        {
            if (arr1[i][j] == arr2[i][j])
            {
                count++;
            }
        }
    }
    printf("%.2lf", 100 * count / (double)(m * n));
    return 0;
}